Received date: 2015-09-21
Revised date: 2015-11-01
Online published: 2017-03-20
A dust storm case during April 22-24, 2012 was studied by analyzing muti-type ground-based observation and satellite observation data, and the WRF-Chem model (Weather Research and Forecasting model coupled with Chemistry) was used to simulate the emission and transport process of this dust storm, and the simulation result is verified by observation results including satellite and ground-based lidar data. The results show that this event is mainly caused by the surface cold front and the upper trough. The simulation result represents the spatial and temporal distribution of dust, which is in accord with the meteorological records at surface stations. Meteorological parameters observed at the surface station changed dramatically during this period, which is associated with strong wind, decreasing temperature and increasing pressure. Simulated surface temperature and humidity are generally in accord with the observation results. Observed PM10 mass concentration and extinction coefficient rose significantly during this period. Simulation results of these variables well represent the overall trend, while peak value is lower than the observation. This study also apply HYSPLIT model to simulate the backward trajectory of the dust, which further conform that dust are mainly originated from Taklimakan desert and Gurbantunggut desert. The forward trajectory simulation shows that dust was transported across Inner Mongolia, Gansu, Ningxia and Shanxi.
Key words: dust storm; WRF-Chem model; numerical simulation
Kang Litai , Chen Siyu . Numerical Modeling of a Dust Storm Process in Northern China[J]. Journal of Desert Research, 2017 , 37(2) : 321 -331 . DOI: 10.7522/j.issn.1000-694X.2015.00246
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